Implement BiDi mirroring

[Khaled Hosny]

The current BiDi implementation doesn't implement mirroring of
bidi_mirrored chars. The attached patch implements it.
http://bugs.winehq.org/show_bug.cgi?id=17166

Changelog:
Implement BiDi mirroring


-- 
 Khaled Hosny
 Arabic localizer and member of Arabeyes.org team
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